Abstract
We present new data on feedhorn-coupled transition-edge sensor devices fabricated for the second-generation receiver (ACTPol) for the Atacama cosmology telescope (ACT). First, we describe optical efficiency measurements of the latest ACTPol detector wafer, which has a $$86\,\pm 15\,\%$$ average optical efficiency. Next, we discuss measurements of the TES resistance as a function of temperature and bias current ( $$R(T,I)$$ ) using the ACTPol time-domain multiplexing electronics. Qualitative agreement between $$R(T,I)$$ data at low bias current and the two-fluid model prediction is shown. Using the two-fluid model and low bias current $$R(T,I)$$ data, $$\alpha $$ and $$\beta $$ at our operating bias current are calculated.
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